Table 1.
Physical properties of different silica nanoparticle from different NaOH formulationsa.
| Concentration of NaOH (mM) |
FESEM size (nm) |
Hydrodynamic radius(nm) |
Zeta- potential (mV) |
|---|---|---|---|
| 10 (sample 1) | 60(±2.4) | 49(±1.2) | −45.2 (±5) |
| 12 (sample 2) | 85(±3.1) | 68(±1.9) | −36.1(±3) |
| 14 (sample 3) | 290(±12.3) | 148(±1.8) | −36.3(±1) |
| 16 (sample 4) | 380(±13.1) | 197(±9.5) | −40.2(±1) |
| 18 (sample 5) | 490(±22.1) | 255(±7.8) | −38.4(±2) |
| 20 (sample 6) | 550(±22.5) | 286(±9.9) | −35.5(±1) |
| 25 | Gel |
a
Tetraethylorthosilicate concentration was 90 mM and 1:1 water–ethanol was employed as medium for synthesis; pH for the measurements was 6.8 with DIW as medium.